This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 13 |
| 5 | 1 |
| 6 | 690 |
| 7 | 29 |
| 8 | 0 |
| 9 | 9207207756 |
| 10 | 67857 |
| 11 | 935759904202397862281423 |
| 12 | 564640443387152026881790255697618312164921101355730025 |
| 13 | 356814640940769181 |
| 14 | 3694582731098 |
| 15 | 18773346867970684437556028438 |
| 16 | 0 |